Enterasys Networks 2H252, 2E253, 2H253, 2H258 manual HOW IT Works

How It Works

A.2 HOW IT WORKS

In Figure A-1, Switch 4, port 1 is registered as being a member of VLAN Blue and then declares this fact out all its ports (2 and 3) to Switch 1 and Switch 2. These two switches register this in the Port VLAN Lists of the ports (Switch 1, port 1 and Switch 2, port 1) that received the frames with the information. Switch 2, which is connected to Switch 3 and Switch 5 declares the same information to those two switches and the Port VLAN List of each port is updated with the new information, accordingly.

Figure A-1 Example of VLAN Propagation via GVRP

D

Switch 1 Switch 2

R	R	D
1	1	2

31

R

Switch 3

2	3
D	D
Switch 4
	R
	1

1

R

Switch 5

End

Station A

R= Port registered as a member of VLAN Blue

	= Port declaring VLAN Blue
D		30691_77

Configuring a VLAN on an 802.1Q switch creates a static GVRP entry. The entry will always remain registered and will not time out. However, dynamic entries will time-out and their registrations are removed from the member list if the end station A is removed. This ensures that if switches are disconnected, or if end stations are removed, the registered information remains accurate.

The end result is that the Port VLAN List of a port is updated with information about VLANs that reside off that port, even if the actual station on the VLAN is several hops away.

A-2Generic Attribute Registration Protocol (GARP)